Traditionally, cemeteries were of such important to Jewish communities that they would buy land for a cemetery before a building for a synagogue. This sentiment was shared by Radomyshl Jews, both those who stayed in the town and those who immigrated to America. Radomyshl itself is home to two Jewish cemeteries, both relatively intact. And in America, Radomyshl Jews bought two cemetery plots in the New York City area via their landsmanshaft, the Radomysler Benevolent Society.
The original Radomyshl Jewish cemetery, located on Velika Zhitomirskaya Street, was used until the late 19th or early 20th century. The modern Radomyshl Jewish cemetery, located in the northwest of the town, was already in use by 1901. The cemetery survived the Holocaust relatively intact, and around 500 gravestones still stand in the cemetery. It was still in use as of 2018. An ohel was built over the graves of three members of the Twersky family (two of them rabbis who died in a pogrom in 1919) in the early 21st century. The European Jewish Cemeteries Initiative (ESJF) visited the cemetery in 2019, during which time they conducted a survey of the cemetery, took pictures of various gravestones, and renovated the fence.
Further details of the Radomyshl Jewish cemetery are available from the ESJF European Jewish Cemeteries Initiative.
The Radomysler Benevolent Society, a landsmanshaft for Jews from Radomyshl, had two cemetery plots in New York City. The first one is in Mount Zion Cemetery in Queens, which they bought in 1905 and houses over 130 graves. The second one is in Beth David Cemetery in Elmont, which they bought in 1926.
Mount Zion Cemetery has a list of their burials on an online database on their website. If you click on this link, you'll see a list of 134 burials in the Radomysler Benevolent Society section. If you wish to visit the cemetery itself, it's on 59-63 54th Ave, Maspeth, Queens, NY. The Radomysler Benevolent Society section is on the Right Section, Path 41, Gate 3. This map should help you find the section, and when you get there consult this map to find the people buried there.
Beth David Cemetery currently doesn't have an online list of burials, but if you contact them they should be able to tell you about burials in the cemetery. If you want to visit the cemetery, it's on 300 Elmont Rd, Elmont, NY. The Radomysler Benevolent Society section is on Block H4, on the corner of Jericho Ave. and Adams Ave. This map should help you find the section, and this map will show you who's buried there and where they are in the cemetery (you can zoom in to improve legibility). JewishGen's Cemetery Discovery Project has additional information including contact information for the caretaker.